CN114556999A - Terminal and wireless communication method - Google Patents

Abstract

A terminal according to an aspect of the present disclosure includes: a reception unit configured to receive a Physical Downlink Control Channel (PDCCH) setting in which the maximum number of Control Resource sets (CORESET) exceeds 3; and a Control unit assumed to specify a Transmission Configuration Indication state (TCI state) of the PDCCH for the CORESET based on a Medium Access Control Element (MAC CE). According to an aspect of the present disclosure, DL communication can be suitably implemented even in the case of using a multi-panel/TRP.

Description

Terminal and wireless communication method

Technical Field

The present disclosure relates to a terminal and a wireless communication method in a next generation mobile communication system.

Background

In a Universal Mobile Telecommunications System (UMTS) network, Long Term Evolution (LTE) is standardized for the purpose of further high data rate, low latency, and the like (non-patent document 1). In addition, LTE-Advanced (3GPP rel.10-14) is standardized for the purpose of further large capacity, Advanced, and the like of LTE (Third Generation Partnership Project (3GPP)) versions (Release (Rel)) 8, 9).

Successor systems of LTE, also referred to as, for example, 5G (5th generation mobile communication system), 5G + (plus), New Radio (NR), 3GPP rel.15 and beyond, are also being studied.

Documents of the prior art

Non-patent document

Non-patent document 13 GPP TS 36.300 V8.12.0 "Evolved Universal Radio Access (E-UTRA) and Evolved Universal Radio Access Network (E-UTRAN); an Overall description; stage 2(Release 8) ", 4 months 2010

Disclosure of Invention

Problems to be solved by the invention

In NR, a User terminal (UE)) receives a downlink control channel (physical downlink control channel (PDCCH)) based on a Transmission Configuration Indication state (TCI state).

In addition, research is being conducted on DL Transmission (e.g., PDCCH Transmission) of one or more Transmission/Reception points (TRPs)) to a UE using one or more panels (multiple panels) in NR. In addition, in order to transmit multiple TRP by multiple PDCCHs, it is considered that the maximum number of Control Resource sets (CORESET) Set for each PDCCH is greater than 3.

However, in the NR specifications so far, multi-panel/TRP is not considered, and therefore there is a case where the TCI state of each PDCCH cannot be appropriately specified in the case of using multiple PDCCHs. Therefore, in the case of the current NR specification, there is a possibility that the spatial diversity gain, high rank transmission, and the like in the case of using the multi-panel/TRP cannot be suitably realized, and the increase in communication throughput is suppressed.

Accordingly, it is an object of the present disclosure to provide a terminal and a wireless communication method capable of suitably implementing DL communication even in the case of using a multi-panel/TRP.

Means for solving the problems

A terminal according to an aspect of the present disclosure includes: a reception unit configured to receive a Physical Downlink Control Channel (PDCCH) setting in which the maximum number of Control Resource sets (CORESET) exceeds 3; and a Control unit assumed to specify a Transmission Configuration Indication state (TCI state) of the PDCCH for the CORESET based on a Medium Access Control Element (MAC CE).

Effects of the invention

According to an aspect of the present disclosure, DL communication can be suitably implemented even in the case of using a multi-panel/TRP.

Drawings

Fig. 1 is a diagram showing a configuration of a UE-specific PDCCH for rel.15 NR indicating MAC CE with TCI status.

Fig. 2A to 2D are diagrams showing an example of a multi-TRP scenario.

Fig. 3 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 4 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 5 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 6 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 7 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 8 is a diagram showing an example of the MAC CE according to embodiment 2-2.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment.

Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment.

Fig. 11 is a diagram showing an example of a configuration of a user terminal according to an embodiment.

Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment.

Detailed Description

(TCI, spatial relationship, QCL)

In NR, the UE is considered to perform reception processing (for example, at least one of reception, demapping, demodulation, and decoding) and Transmission processing (for example, at least one of Transmission, mapping, precoding, modulation, and coding) of at least one of a control signal and a channel (may be referred to as a signal/channel, in the present disclosure, "a/B" may be replaced with "at least one of a and B") based on a Transmission Configuration Indication state (TCI state), and the like.

The TCI status may also represent the status of the signal/channel being applied to the downlink. The state corresponding to the TCI state applied to the uplink signal/channel may also be expressed as a spatial relationship (spatial relationship).

The TCI state refers to Information related to Quasi-Co-location (qcl) of a signal/channel, and may also be referred to as Spatial reception parameters, Spatial Relationship Information (SRI), and the like. The TCI status may also be set to the UE per channel or per signal.

QCL is an indicator representing the nature of the statistics of a signal/channel. For example, when a certain signal/channel and another signal/channel are in a QCL relationship, it may be assumed that at least one of Doppler shift (Doppler shift), Doppler spread (Doppler spread), average delay (average delay), delay spread (delay spread), and spatial parameter (spatial Rx parameter) (for example, spatial Rx parameter)) is the same among these different signals/channels (at least one of these is a QCL).

The spatial reception parameter may correspond to a reception beam (for example, a reception analog beam) of the UE, or may be determined based on a spatial QCL. QCL (or at least one element of QCL) in the present disclosure may also be replaced with sQCL (spatial QCL).

QCLs may also be specified in multiple types (QCL types). For example, 4 QCL types a-D may be set, and in the 4 QCL types a-D, the same parameter (or parameter set) can be assumed to be different, and the parameter (which may also be referred to as a QCL parameter) is represented as follows:

QCL type A: doppler shift, doppler spread, mean delay, and delay spread,

QCL type B: the doppler shift and the doppler spread are then combined,

QCL type C: the doppler shift and the average delay are then determined,

QCL type D: the space receives the parameters.

The types a to C may correspond to QCL information related to synchronization processing of at least one of time and frequency, and the type D may correspond to QCL information related to beam control.

The case where the UE assumes a specific Control Resource Set (core), channel or reference signal and another core, channel or reference signal are in a specific QCL (e.g., QCL type D) relationship may also be referred to as QCL assumption (QCL assumption).

The UE may also determine at least one of a transmit beam (Tx beam) and a receive beam (Rx beam) for a signal/channel based on the TCI status or QCL assumption for the signal/channel.

The TCI state may be information on QCL between a channel to be a target (or a Reference Signal (RS)) for the channel) and another Signal (for example, another Downlink Reference Signal (DL-RS))). The TCI status may also be set (indicated) by higher layer signaling, physical layer signaling, or a combination thereof.

In the present disclosure, the higher layer signaling may be any one of or a combination of Radio Resource Control (RRC) signaling, Medium Access Control (MAC) signaling, broadcast information, and the like, for example.

MAC signaling may also use, for example, a MAC Control Element (media access Control Element (MAC CE)), a MAC Protocol Data Unit (PDU), and the like. The broadcast Information may be, for example, a Master Information Block (MIB), a System Information Block (SIB), Minimum System Information (Remaining Minimum System Information (RMSI)), or Other System Information (OSI)).

The physical layer signaling may be, for example, Downlink Control Information (DCI)).

The Channel to which the TCI state is set (designated) may be at least one of a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH)), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))), an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), and an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))).

The RS (DL-RS) that has a QCL relationship with the Channel may be at least one of a Synchronization Signal Block (SSB), a Channel State Information Reference Signal (CSI-RS), and a measurement Reference Signal (Sounding Reference Signal (SRS)). Alternatively, the DL-RS may be a CSI-RS (also referred to as Tracking Reference Signal (TRS)) used for Tracking or a Reference Signal (also referred to as QRS) used for QCL detection.

The SSB is a Signal block including at least one of a Primary Synchronization Signal (PSS), a Secondary Synchronization Signal (SSS), and a Broadcast Channel (Physical Broadcast Channel (PBCH)). The SSBs may also be referred to as SS/PBCH blocks.

< TCI State for PDCCH >

Information on QCLs of the PDCCH (or DMRS antenna port associated with the PDCCH) and the specific DL-RS may also be referred to as TCI status for the PDCCH, and the like.

The UE may also determine the TCI status for the UE-specific pdcch (coreset) based on higher layer signaling.

For example, for the UE, one or more (K) TCI states may be set per CORESET by RRC signaling (ControlResourceSet information element). Furthermore, the UE may also activate (activate) one or more TCI states using the MAC CE for each CORESET, respectively. The MAC CE may also be referred to as a TCI status Indication MAC CE (TCI State Indication for UE-specific PDCCH MAC CE) for UE-specific PDCCH. The UE may also perform monitoring of the CORESET based on the activated TCI state corresponding to the CORESET.

Fig. 1 is a diagram showing a configuration of a UE-specific PDCCH for rel.15 NR indicating MAC CE with TCI status. Fig. 1 shows a bit sequence constituting a MAC CE, which is expressed by 2 octets (8 bits × 2 bits — 16 bits) of octets (octets, Oct)1-2 shown in the figure.

The MAC CE includes a Serving Cell Identifier (ID) field ("Serving Cell ID") field, a CORESET ID field ("CORESET ID") field, and a TCI State ID field ("TCI State ID") field.

The serving cell ID field is a 5-bit field indicating the ID of the serving cell to which the MAC CE is applied (in other words, to which the TCI state is specified/activated).

The CORESET ID field is a 4-bit field that identifies the CORESET ID (high-level parameter "ControlResourceSetID") that is an indication object of the TCI status. The case where the value of the CORESET ID field is 0 indicates a shared CORESET (also referred to as CORESET #0, CORESET zero, CORESET for receiving SIB1, or the like), and values of 1 or more indicate other CORESETs.

The CORESET #0 may be set to the UE by the setting information for the CORESET #0 (RRC information element "controlled resource set zero"), and the other CORESET may be set to the UE by the CORESET setting information (RRC information element "controlled resource set").

The TCI status ID field is a 7-bit field identifying the TCI status ID that can be applied to the CORESET identified by the CORESET ID field.

In the case where the CORESET ID field is set to 0, the TCI state ID field may also indicate a TCI state ID corresponding to any one of the first 64 TCI States among TCI States (TCI States set by the RRC parameters "TCI-States-ToAddModList" and "TCI-States-ToReleaseList") set for PDSCH setting information (RRC information element "PDSCH-Config") in the activated Bandwidth Part (BWP)).

When the CORESET ID field is set to a value other than 0, the TCI state ID field may indicate a TCI state ID corresponding to any one of TCI states (TCI states set by RRC parameters "TCI-statepdcch-ToAddList" and "TCI-statepdcch-ToReleaseList") set for the CORESET corresponding to the indicated CORESET ID.

(multiple TRP)

In NR, studies are underway: one or more Transmission/Reception points (TRPs) (multiple TRPs) use one or more panels (multi-panel) for DL Transmission to a UE. Further, studies are being made for: the UE UL transmits for one or more TRPs.

Note that a plurality of TRPs may correspond to the same cell Identifier (ID)) or different cell IDs. The cell ID may be a physical cell ID or a virtual cell ID.

Fig. 2A to 2D are diagrams showing an example of a multi-TRP scenario. In these examples, it is assumed that 4 different beams can be transmitted for each TRP, but not limited thereto.

Fig. 2A shows an example of a case where only 1 TRP (TRP 1 in this example) among multiple TRPs is transmitted to a UE (may also be referred to as a single mode, a single TRP, or the like). In this case, TRP1 transmits both a control signal (PDCCH) and a data signal (PDSCH) to the UE.

Fig. 2B shows an example of a case where only 1 TRP (TRP 1 in this example) among multiple TRPs transmits a control signal to a UE and the multiple TRPs transmits a data signal (may be referred to as a single master mode). The UE receives each PDSCH transmitted from the plurality of TRPs based on 1 Downlink Control Information (DCI)).

Fig. 2C shows an example of a case where each of multiple TRPs transmits a part of a control signal to a UE and the multiple TRPs transmits a data signal (may be referred to as a master-slave mode). Part 1 of the control signal (DCI) may be transmitted to TRP1 and part 2 of the control signal (DCI) may be transmitted to TRP 2. Part 2 of the control signal may also depend on part 1. The UE receives the PDSCHs transmitted from the plurality of TRPs based on the portions of the DCI.

Fig. 2D shows an example of a case where multiple TRPs transmit data signals (which may be referred to as a multi-master mode) by transmitting separate control signals to a UE. The first control signal (DCI) may be transmitted to the TRP1, and the second control signal (DCI) may be transmitted to the TRP 2. The UE receives each PDSCH transmitted from the multiple TRPs based on the DCI.

In the case where multiple PDSCHs from multiple TRPs (which may also be referred to as multiple PDSCHs) (multiple PDSCHs)) are scheduled using 1 DCI as in fig. 2B, the DCI may also be referred to as a single DCI (single PDCCH). In addition, in the case where a plurality of PDSCHs from multiple TRPs, such as fig. 2D, are scheduled using a plurality of DCIs, these plurality of DCIs may also be referred to as multiple DCIs (multiple pdcchs).

Different codewords (Code Word (CW)) and different layers may also be transmitted from each TRP of the multiple TRPs. As one method of multi-TRP Transmission, Non-Coherent Joint Transmission (NCJT) is being studied.

In NCJT, for example, TRP1 performs modulation mapping, layer mapping on a first codeword, and transmits a first PDSCH using a first precoding for a first number of layers (e.g., 2 layers). Also, the TRP2 modulation maps, layer maps, and transmits the second PDSCH using the second precoding for a second number of layers (e.g., 2 layers).

The NCJT-based multiple PDSCHs (multiple PDSCHs) may be defined to partially or completely overlap at least one of the time domain and the frequency domain. That is, the first PDSCH from the first TRP and the second PDSCH from the second TRP may overlap in at least one of time and frequency resources.

These first PDSCH and second PDSCH may also be assumed not to be Quasi-Co-located (qcl) relationship. The reception of multiple PDSCHs may also be replaced with simultaneous reception of PDSCHs that are not of a particular QCL type (e.g., QCL type D).

According to such a multi-TRP scenario, more flexible transmission control using a channel with good quality can be performed.

However, in the NR specifications so far, the multi-panel/TRP is not considered, and hence the QCL assumption of the case of using the multi-panel/TRP cannot be appropriately controlled.

However, in the existing rel.15 NR specification, the maximum number of CORESET per PDCCH setting (PDCCH-Config) is limited to 3. In other words, the network may also set up a maximum of 3 CORESET for 1 BWP of 1 cell.

The CORESET ID (RRC parameter "controlResourceSetID") possessed by the CORESET setting (RRC information element "controlResourceSetID") does not contain a value of '0'. That is, in the rel.15 NR specification, the PDCCH setting can include 3 sets of CORESET, but the set 3 sets of CORESET do not include CORESET # 0.

BWPs up to 4 can be set for 1 cell, and the maximum number of CORESET per 1 serving cell (the maximum number of CORESET that is set using CORESET) is 12.

For multi-TRP transmission based on multi-DCI, it is being studied to make the maximum number of CORESET set per PDCCH (the maximum number of CORESET that can be mutually replaced with each BWP) larger than 3. On the other hand, in the TCI status indication MAC CE for UE-specific PDCCH of rel.15 NR shown in fig. 1, the CORESET ID field is 4 bits, and thus, the indicated value is from 0 to 15.

Therefore, if the number of CORESET set for the UE is not limited or CORESET ID larger than 15 can be specified for the UE, the TCI state of each PDCCH cannot be appropriately specified in the case of using multiple PDCCHs. However, such studies have not been conducted so far. Therefore, in the case of the current NR specification, there is a possibility that the spatial diversity gain, high rank transmission, and the like in the case of using the multi-panel/TRP cannot be suitably realized, and the increase in communication throughput is suppressed.

Therefore, the inventors of the present invention conceived of an assumption of CORESET and a method of specifying the TCI state of PDCCH that can cope with the case of using multiple panels/TRPs.

Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings. The radio communication methods according to the respective embodiments may be applied individually or in combination.

In addition, in the present disclosure, a panel, an uplink (ul) transmitting entity, a TRP, a spatial relationship, a COntrol REsource SET (core), a PDSCH, a codeword, a base station, a specific antenna port (e.g., a DeModulation Reference Signal (DMRS)) port), a specific antenna port group (e.g., a DMRS port group), a specific group (e.g., a Code Division Multiplexing (CDM) group, a specific Reference Signal group, a core group), and the like may be mutually replaced. In addition, the panel identifier (id)) and the panel may be replaced with each other. The TRP ID and TRP may also be replaced with each other.

(Wireless communication method)

< first embodiment >

The maximum number of CORESET per 1 serving cell may be determined based on the maximum number of BWPs to be set (embodiment 1-1).

In embodiment 1-1, the maximum number of CORESET per 1 serving cell may be determined as the maximum number of CORESET per BWP × the maximum number of set BWPs. For example, when the maximum number of CORESET per BWP is 5 and the maximum number of BWPs set for multi-TRP is 4, the maximum number of CORESET per 1 serving cell for multi-TRP may be 5 × 4 to 20.

In embodiment 1-1, it is also conceivable that the maximum number of CORESET per CORESET is not greater than (less than) a specific number (e.g., 11, 12, etc.).

It can also be assumed that the maximum number of CORESET per 1 serving cell is 16 at maximum (embodiment 1-2).

In embodiment 1-2, the UE may derive the set maximum number of BWPs from the maximum number of CORESET per 1 serving cell and the maximum number of CORESET per BWP.

For example, when the maximum number of CORESETs per BWP is 5, the maximum number of BWPs to be set may be floor (16/5) or 3 (maximum number of CORESETs per 1 serving cell/maximum number of CORESETs per BWP). In addition, floor (x) is a floor function, which represents the largest integer below x for a real number x.

When the maximum number of CORESET per BWP is 4, the set maximum number of BWP may be floor (16/4) or 4 (maximum number of CORESET per 1 serving cell/maximum number of CORESET per BWP).

In other words, the UE may also assume that the maximum number of CORESET for each BWP x the maximum number of BWPs being set does not exceed a certain number (e.g., 15, 16, etc.).

According to the first embodiment described above, even when the maximum number of CORESET for each PDCCH is larger than rel.15 NR, it is possible to appropriately grasp the maximum number of CORESET for each serving cell, and it is possible to appropriately activate the TCI state of each PDCCH by recognizing the size of the CORESET ID field of the MAC CE shown in the second embodiment described later, for example.

< second embodiment >

When the maximum number of CORESET per serving cell is 16 or less, the UE may also assume that the TCI status of the PDCCH of CORESET of the serving cell is specified as the TCI status indication MAC CE for the UE-specific PDCCH using rel.15 NR (embodiment 2-1).

The UE may also be conceived as: a new TCI status indication MAC CE for UE-specific PDCCH (hereinafter, may be simply referred to as "new MAC CE") different from the TCI status indication MAC CE for UE-specific PDCCH of rel.15 NR is used, and the TCI status of PDCCH of core set of the serving cell is specified (embodiment 2-2).

Note that the phrase "the UE-specific PDCCH of rel.15 NR indicates that the MAC CE is different in TCI status" may mean that the size of the MAC CE is different, that the size of some fields is different even though the size of the MAC CE is the same, or that a new field is included.

The range of values corresponding to the CORESET ID field of the new MAC CE may also be a value specific to 0 or more (e.g., may also be referred to as a maximum number of CORESETs per CORESET group ("maxnrofcontrolresourcesetspersgroup", etc.)). The specific value may be the same or different for each CORESET.

The new MAC CE of embodiment 2-2 may also include: a field for identifying a CORESET group to which the MAC CE is applied (may also be referred to as a CORESET group ID field). The CORESET group ID field may be a separate (explicit) field or a field included in a part of other fields.

For example, the CORESET group ID field may also be part of the TCI State ID field. The CORESET group ID field may also be represented by the Most Significant Bit (MSB))1 Bit or the Least Significant Bit (LSB))1 Bit of the TCI status ID field. In this case, the remaining 6 bits of the TCI state ID field may also represent the TCI state for the CORESET group corresponding to the CORESET group ID field.

In addition, the CORESET group ID field may be always included in the new MAC CE. It is also conceivable that: the CORESET group ID field is limited to exist only if at least one CORESET group ID is set or the utilization of the CORESET group is set to active through higher layer signaling.

Fig. 3 is a diagram showing an example of the MAC CE according to embodiment 2-2. The size of the MAC CE in this example is the same as the UE specific PDCCH of rel.15 NR indicating MAC CE with TCI status, but the meaning of the TCI status ID field is slightly different.

In the MAC CE of fig. 3, when the core set ID field is set to 0, the TCI status ID field may be interpreted in the same manner as the TCI status indication MAC CE for UE-specific PDCCH of rel.15 NR.

In the MAC CE of fig. 3, in the case where the core set ID field is set to other than 0, it can be interpreted as: the MSB of 1 bit of the TCI status ID field represents the CORESET group ID field, and the LSB of 6 bits represents the TCI status ID of the corresponding CORESET group.

The UE may for example also be conceived as: the LSB of 6 bits represents the TCI state ID of the first CORESET in case of 1-bit MSB '0', and the LSB of 6 bits represents the TCI state ID of the second CORESET in case of 1-bit MSB '1'.

Fig. 4 is a diagram showing an example of the MAC CE according to embodiment 2-2. The MAC CE of this example is similar to fig. 3, but is different in that 1-bit LSB of the TCI state ID field represents the CORESET group ID field, and 6-bit MSB represents the TCI state ID of the corresponding CORESET group.

Fig. 5 is a diagram showing an example of the MAC CE according to embodiment 2-2. The size of the MAC CE in this example is larger (24 bits) than the UE specific PDCCH of rel.15 NR with TCI status indication MAC CE.

The MAC CE of fig. 5 includes a 1-bit CORESET group ID field. In addition, the MAC CE may also include a 4-bit CORESET ID field. In addition, the size of the CORESET ID field is not limited thereto. The size of the core set ID field may also be recognized by the UE based on the maximum number of core sets per serving cell (the same may be true for other MAC CEs).

The TCI status ID field in the MAC CE may be 7 bits, or may be interpreted as the TCI status indication MAC CE for UE-specific PDCCH of rel.15 NR.

Fig. 6 is a diagram showing an example of the MAC CE according to embodiment 2-2. The size of the MAC CE in this example is larger (24 bits) than the UE specific PDCCH of rel.15 NR with TCI status indication MAC CE.

The MAC CE of fig. 6 does not include a CORESET group ID field. The UE may also determine the CORESET group ID to which the MAC CE is applied from the value of the CORESET ID.

For example, when the core set ID field of the MAC CE is 0 or more and X or less (for example, X is an integer of 11 or less), the UE may assume that the TCI state ID field of the MAC CE indicates the TCI state of the first core set (for example, core set 1). The value of X may also be set for the UE using higher layer signaling.

For example, when the core set ID field of the MAC CE is X +1 or more and the maximum number of core sets per serving cell (which may be referred to as "maxnrofcontrolresources sets") is-1 or less, the UE may assume that the TCI state ID field of the MAC CE indicates the TCI state of the second core set (for example, core set 2).

In addition, the association of the CORESET group ID and the CORESET ID is not limited thereto. The association may be predetermined by a specification or may be set to the UE by higher layer signaling or the like. The association may also be determined based on the BWP index, the CORESET index for each TRP, and the like.

Fig. 7 is a diagram showing an example of the MAC CE according to embodiment 2-2. The size of the MAC CE in this example is larger (24 bits) than the UE specific PDCCH of rel.15 NR with TCI status indication MAC CE.

In the MAC CE of fig. 7, the TCI status ID field is not used as the TCI status ID in the case where the core set ID field is set to 0. This is a different interpretation than the TCI status ID field of existing MAC CEs. The TCI status ID field of fig. 7 may be either 6 bits or 7 bits.

On the other hand, the MAC CE in fig. 7 includes a TCI status ID field for core set #0 ("TCI State ID for core set # 0"). The TCI status ID field for core set #0 may be included only when the core set ID field is set to 0, and may not be included in other cases. The TCI state ID field for CORESET0 of fig. 7 may be either 6 bits or 7 bits.

In addition, when the MAC CE in fig. 7 includes both the TCI status ID field and the TCI status ID field for core set #0, the UE may determine the TCI status of core set corresponding to the core set ID (a value other than 0) based on the TCI status ID field, or may determine the TCI status of core set corresponding to core set #0 based on the TCI status ID field for core set #0, for example.

Fig. 8 is a diagram showing an example of the MAC CE according to embodiment 2-2. The size of the MAC CE in this example may be the same as the UE-specific PDCCH for rel.15 NR TCI status indication MAC CE.

The MAC CE of fig. 8 may also be used for CORESET other than CORESET # 0. The UE may also be conceived as: the TCI status of CORESET #0 is specified by the existing MAC CE, and the TCI status of the other CORESET is specified by the MAC CE of fig. 8.

The core set ID field of the MAC CE of fig. 8 may be 4 bits or 5 bits, for example. The CORESET ID field may be 4 bits when the maximum number of CORESETs per BWP is 4 (in this case, 5 CORESETs including CORESET #0 can also be used for each BWP), or may be 5 bits when the maximum number of CORESETs per BWP is 5 (in this case, 5 CORESETs other than CORESET #0 can also be used for each BWP).

In the MAC CE of fig. 8, the TCI status ID field is not used for the TCI status ID in the case where the core set ID field is set to 0. The TCI status ID field of fig. 8 may be either 6 bits or 7 bits.

The UE may also be conceived as: the new MAC CE according to embodiment 2-2 is applied when a specific higher layer parameter (for example, an arbitrary CORESET group ID, multiple PDCCH, multiple TRP, or the like) is set, and the existing MAC CE is applied otherwise.

The UE may also identify the new MAC CE based on a Logical Channel ID (Logical Channel Identifier (LCID)) included in a MAC subheader of the MAC PDU. For example, although the existing MAC CE is identified by LCID 53, the new MAC CE may be identified by a value different from the LCID (e.g., any one of values from 33 to 46).

According to the second embodiment described above, by using a TCI status indication MAC CE for UE-specific PDCCH of which the size of the CORESET ID field is larger than rel.15 NR or a new MAC CE capable of specifying the CORESET group ID, for example, the TCI status of each PDCCH can be appropriately specified even in a case where multiple PDCCHs are applied.

< other embodiments >

The above embodiments can be applied to a case where multi-TRP transmission based on multi-DCI (multi-PDCCH) is performed, but are not limited thereto. The above-described embodiments may be used in a case where multi-TRP transmission is performed by single DCI (single PDCCH), or may be used in a case where single-TRP transmission is performed.

The method of adding the index of the CORESET ID (indexing) may be common (global) to all panels (or TRP or CORESET), or may be independent for each panel (or TRP or CORESET).

(Wireless communication System)

Hereinafter, a configuration of a radio communication system according to an embodiment of the present disclosure will be described. In this radio communication system, communication is performed using one of the radio communication methods according to the above embodiments of the present disclosure or a combination thereof.

Fig. 9 is a diagram showing an example of a schematic configuration of a radio communication system according to an embodiment. The wireless communication system 1 may be a system that realizes communication using Long Term Evolution (LTE) standardized by the Third Generation Partnership Project (3GPP), New wireless (5th Generation mobile communication system New Radio (5G NR)) of the fifth Generation mobile communication system, or the like.

In addition, the wireless communication system 1 may also support Dual Connectivity (Multi-RAT Dual Connectivity (MR-DC)) between a plurality of Radio Access Technologies (RATs). The MR-DC may include Dual connection of LTE (Evolved Universal Terrestrial Radio Access (E-UTRA)) and NR (E-UTRA-NR Dual Connectivity (EN-DC))), Dual connection of NR and LTE (NR-E-UTRA Dual Connectivity (NE-DC))), and the like.

In EN-DC, a base station (eNB) of LTE (E-UTRA) is a Master Node (MN), and a base station (gNB) of NR is a Slave Node (SN). In NE-DC, the base station of NR (gNB) is MN and the base station of LTE (E-UTRA) (eNB) is SN.

The wireless communication system 1 may support Dual connection between a plurality of base stations in the same RAT (for example, Dual connection between MN and SN (NR-NR Dual connection (NN-DC)) of a base station (gNB) in which both of MN and SN are NR).

The wireless communication system 1 may include a base station 11 forming a macrocell C1 having a relatively wide coverage area, and a base station 12(12a to 12C) arranged within the macrocell C1 and forming a small cell C2 narrower than the macrocell C1. The user terminal 20 may also be located in at least one cell. The arrangement, number, and the like of each cell and user terminals 20 are not limited to the illustrated embodiments. Hereinafter, the base stations 11 and 12 are collectively referred to as the base station 10 without distinguishing them.

The user terminal 20 may also be connected to at least one of the plurality of base stations 10. The user terminal 20 may use at least one of Carrier Aggregation (CA) and Dual Connectivity (DC) using a plurality of Component Carriers (CCs)).

Each CC may be included in at least one of the first Frequency band (Frequency Range 1(FR1))) and the second Frequency band (Frequency Range 2(FR 2)). Macro cell C1 may also be contained in FR1, and small cell C2 may also be contained in FR 2. For example, FR1 may be a frequency band of 6GHz or less (sub-6GHz), and FR2 may be a frequency band higher than 24GHz (above-24 GHz). The frequency bands, definitions, and the like of FR1 and FR2 are not limited to these, and FR1 may correspond to a higher frequency band than FR2, for example.

The user terminal 20 may perform communication using at least one of Time Division Duplex (TDD) and Frequency Division Duplex (FDD) in each CC.

The plurality of base stations 10 may also be connected by wire (e.g., optical fiber conforming to Common Public Radio Interface (CPRI)), X2 Interface, or the like) or wireless (e.g., NR communication). For example, when NR communication between base stations 11 and 12 is used as a Backhaul, base station 11 corresponding to an upper station may be referred to as an Integrated Access Backhaul (IAB) host, and base station 12 corresponding to a relay (relay) may be referred to as an IAB node.

The base station 10 may also be connected to the core network 30 via other base stations 10 or directly. The Core Network 30 may include at least one of an Evolved Packet Core (EPC), a 5G Core Network (5GCN)), a Next Generation Core (NGC), and the like, for example.

The user terminal 20 may be a terminal supporting at least one of communication systems such as LTE, LTE-a, and 5G.

The radio communication system 1 may use a radio access scheme based on Orthogonal Frequency Division Multiplexing (OFDM). For example, at least one of downlink (dl) and uplink (ul)) may use: cyclic Prefix OFDM (CP-OFDM)), Discrete Fourier Transform Spread OFDM (DFT-s-OFDM)), Orthogonal Frequency Division Multiple Access (OFDMA), Single Carrier Frequency Division Multiple Access (SC-FDMA)), and the like.

The radio access method may also be referred to as a waveform (waveform). In the wireless communication system 1, other wireless access schemes (e.g., other single-carrier transmission schemes and other multi-carrier transmission schemes) may be used for the UL and DL wireless access schemes.

In the radio communication system 1, as a Downlink Channel, a Downlink Shared Channel (Physical Downlink Shared Channel (PDSCH))), a Broadcast Channel (Physical Broadcast Channel (PBCH))), a Downlink Control Channel (Physical Downlink Control Channel (PDCCH))) and the like that are Shared by the user terminals 20 may be used.

In the radio communication system 1, as an Uplink Channel, an Uplink Shared Channel (Physical Uplink Shared Channel (PUSCH))), an Uplink Control Channel (Physical Uplink Control Channel (PUCCH))), a Random Access Channel (Physical Random Access Channel (PRACH)), and the like, which are Shared by the user terminals 20, may be used.

User data, higher layer control Information, a System Information Block (SIB), and the like are transmitted through the PDSCH. User data, higher layer control information, etc. may also be transmitted over the PUSCH. In addition, a Master Information Block (MIB) may also be transmitted through the PBCH.

The lower layer control information may also be transmitted through the PDCCH. The lower layer Control Information may include, for example, Downlink Control Information (DCI) including scheduling Information of at least one of a PDSCH and a PUSCH.

Furthermore, DCI that schedules PDSCH may be referred to as DL assignment, DL DCI, or the like, and DCI that schedules PUSCH may be referred to as UL grant, UL DCI, or the like. In addition, the PDSCH may be replaced with DL data and the PUSCH may be replaced with UL data.

For PDCCH detection, a COntrol REsource SET (countrol REsource SET (CORESET)) and a search space (search space) may be used. CORESET corresponds to searching for DCI resources. The search space corresponds to a search region and a search method of PDCCH candidates (PDCCH candidates). A CORESET may also be associated with one or more search spaces. The UE may also monitor the CORESET associated with a search space based on the search space settings.

One search space may correspond to PDCCH candidates corresponding to one or more aggregation levels (aggregation levels). The one or more search spaces may also be referred to as a set of search spaces. In addition, "search space", "search space set", "search space setting", "search space set setting", "CORESET setting", and the like of the present disclosure may be replaced with each other.

Uplink Control Information (UCI)) including at least one of Channel State Information (CSI), ACKnowledgement Information (which may also be referred to as Hybrid Automatic Repeat reQuest ACKnowledgement (HARQ-ACK)), ACK/NACK, and Scheduling ReQuest (SR)) may also be transmitted through the PUCCH. The random access preamble for establishing a connection with a cell may also be transmitted through the PRACH.

In the present disclosure, a downlink, an uplink, and the like may be expressed without adding a "link". Note that the "Physical (Physical)" may not be added to the beginning of each channel.

In the wireless communication system 1, a Synchronization Signal (SS), a Downlink Reference Signal (DL-RS), and the like may be transmitted. In the wireless communication system 1, a Cell-specific Reference Signal (CRS), a Channel State Information Reference Signal (CSI-RS), a DeModulation Reference Signal (DMRS), a Positioning Reference Signal (PRS), a Phase Tracking Reference Signal (PTRS), and the like may be transmitted as DL-RSs.

The Synchronization Signal may be at least one of a Primary Synchronization Signal (PSS) and a Secondary Synchronization Signal (SSS), for example. The signal blocks containing SS (PSS, SSs) and PBCH (and DMRS for PBCH) may also be referred to as SS/PBCH blocks, SS blocks (SSB), and the like. In addition, SS, SSB, etc. may also be referred to as reference signals.

In the wireless communication system 1, a measurement Reference Signal (SRS), a demodulation Reference Signal (DMRS), and the like may be transmitted as an Uplink Reference Signal (UL-RS). In addition, the DMRS may also be referred to as a user terminal specific Reference Signal (UE-specific Reference Signal).

(base station)

Fig. 10 is a diagram showing an example of the configuration of a base station according to an embodiment. The base station 10 includes a control unit 110, a transmission/reception unit 120, a transmission/reception antenna 130, and a transmission line interface (transmission line interface) 140. The control unit 110, the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission line interface 140 may be provided in one or more numbers.

In this example, the functional blocks of the characteristic portions in the present embodiment are mainly shown, but it is also conceivable that the base station 10 further includes other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 110 performs overall control of the base station 10. The control unit 110 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 110 may also control generation, scheduling (e.g., resource allocation, mapping), etc. of signals. The control unit 110 may control transmission/reception, measurement, and the like using the transmission/reception unit 120, the transmission/reception antenna 130, and the transmission path interface 140. Control section 110 may generate data, control information, sequence (sequence), and the like to be transmitted as a signal, and forward the generated data to transmission/reception section 120. The control unit 110 may perform call processing (setting, release, and the like) of a communication channel, state management of the base station 10, management of radio resources, and the like.

The transceiver 120 may also include a baseband (baseband) unit 121, a Radio Frequency (RF) unit 122, and a measurement unit 123. The baseband unit 121 may also include a transmission processing unit 1211 and a reception processing unit 1212. The transmission/reception section 120 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 120 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission unit may be constituted by the transmission processing unit 1211 and the RF unit 122. The receiving unit may be configured by the reception processing unit 1212, the RF unit 122, and the measurement unit 123.

The transmitting/receiving antenna 130 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 120 may transmit the above-described downlink channel, synchronization signal, downlink reference signal, and the like. The transmission/reception unit 120 may receive the uplink channel, the uplink reference signal, and the like.

Transmit/receive section 120 may form at least one of a transmit beam and a receive beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

For example, the transmission/reception unit 120 (transmission processing unit 1211) may perform processing of a Packet Data Convergence Protocol (PDCP) layer, processing of a Radio Link Control (RLC) layer (e.g., RLC retransmission Control), processing of a Medium Access Control (MAC) layer (e.g., HARQ retransmission Control), and the like on Data, Control information, and the like acquired from the Control unit 110, and generate a bit string to be transmitted.

Transmission/reception section 120 (transmission processing section 1211) may perform transmission processing such as channel coding (which may include error correction coding), modulation, mapping, filter processing, Discrete Fourier Transform (DFT) processing (if necessary), Inverse Fast Fourier Transform (IFFT) processing, precoding, and digital-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

The transmission/reception section 120(RF section 122) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 130.

On the other hand, the transmission/reception section 120(RF section 122) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 130.

Transmission/reception section 120 (reception processing section 1212) may apply reception processing such as analog-digital conversion, Fast Fourier Transform (FFT) processing, Inverse Discrete Fourier Transform (IDFT) processing (if necessary), filter processing, demapping, demodulation, decoding (may include error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal to acquire user data.

The transmission/reception unit 120 (measurement unit 123) may also perform measurement related to the received signal. For example, measurement section 123 may perform Radio Resource Management (RRM) measurement, Channel State Information (CSI) measurement, and the like based on the received signal. Measurement section 123 may also perform measurement on Received Power (e.g., Reference Signal Received Power (RSRP)), Received Quality (e.g., Reference Signal Received Quality (RSRQ)), Signal to Interference plus Noise Ratio (SINR)), Signal to Noise Ratio (SNR)), Signal Strength (e.g., Received Signal Strength Indicator (RSSI)), propagation path information (e.g., CSI), and the like. The measurement results may also be output to the control unit 110.

The transmission path interface 140 may transmit/receive signals (backhaul signaling) between devices included in the core network 30 and other base stations 10, and acquire/transmit user data (user plane data) and control plane data used for the user terminal 20.

The transmitting unit and the receiving unit of the base station 10 in the present disclosure may be configured by at least one of the transmitting/receiving unit 120, the transmitting/receiving antenna 130, and the transmission line interface 140.

The transmission/reception unit 120 may transmit one or both of a plurality of Downlink Shared channels (Physical Downlink Shared channels (PDSCHs)) scheduled based on a plurality of Downlink control information (multiple PDCCHs).

The transceiver 120 may transmit a Physical Downlink Control Channel (PDCCH) setting in which the maximum number of Control Resource sets (CORESET) exceeds 3 to the user terminal 20.

(user terminal)

Fig. 11 is a diagram showing an example of a configuration of a user terminal according to an embodiment. The user terminal 20 includes a control unit 210, a transmission/reception unit 220, and a transmission/reception antenna 230. Further, the control unit 210, the transmission/reception unit 220, and the transmission/reception antenna 230 may be provided with one or more antennas.

In this example, the functional blocks mainly representing the characteristic parts in the present embodiment are assumed to be provided, and the user terminal 20 may further include other functional blocks necessary for wireless communication. A part of the processing of each unit described below may be omitted.

The control unit 210 performs overall control of the user terminal 20. The control unit 210 can be configured by a controller, a control circuit, and the like described based on common knowledge in the technical field of the present disclosure.

The control unit 210 may also control generation, mapping, and the like of signals. Control section 210 may control transmission/reception, measurement, and the like using transmission/reception section 220 and transmission/reception antenna 230. Control section 210 may generate data, control information, a sequence, and the like to be transmitted as a signal and transfer the signal to transmission/reception section 220.

The transceiver unit 220 may also include a baseband unit 221, an RF unit 222, and a measurement unit 223. The baseband section 221 may include a transmission processing section 2211 and a reception processing section 2212. The transmission/reception section 220 can be configured by a transmitter/receiver, an RF circuit, a baseband circuit, a filter, a phase shifter (phase shifter), a measurement circuit, a transmission/reception circuit, and the like, which are described based on common knowledge in the technical field of the present disclosure.

The transmission/reception unit 220 may be configured as an integrated transmission/reception unit, or may be configured by a transmission unit and a reception unit. The transmission section may be constituted by the transmission processing section 2211 and the RF section 222. The receiving unit may be composed of a reception processing unit 2212, an RF unit 222, and a measuring unit 223.

The transmission/reception antenna 230 can be configured by an antenna described based on common knowledge in the technical field of the present disclosure, for example, an array antenna.

The transmitting/receiving unit 220 may receive the downlink channel, the synchronization signal, the downlink reference signal, and the like. The transmission/reception unit 220 may transmit the uplink channel, the uplink reference signal, and the like described above.

Transmission/reception section 220 may form at least one of a transmission beam and a reception beam using digital beamforming (e.g., precoding), analog beamforming (e.g., phase rotation), and the like.

Transmission/reception section 220 (transmission processing section 2211) may perform, for example, PDCP layer processing, RLC layer processing (e.g., RLC retransmission control), MAC layer processing (e.g., HARQ retransmission control), and the like on the data, control information, and the like acquired from control section 210, and generate a bit sequence to be transmitted.

Transmission/reception section 220 (transmission processing section 2211) may perform transmission processing such as channel coding (including error correction coding as well), modulation, mapping, filter processing, DFT processing (if necessary), IFFT processing, precoding, and digital-to-analog conversion on a bit sequence to be transmitted, and output a baseband signal.

Whether or not DFT processing is applied may be set based on transform precoding. When transform precoding is effective (enabled) for a certain channel (e.g., PUSCH), transmission/reception section 220 (transmission processing section 2211) may perform DFT processing as the transmission processing in order to transmit the channel using a DFT-s-OFDM waveform, and when not, may not perform DFT processing as the transmission processing.

The transmission/reception section 220(RF section 222) may perform modulation, filter processing, amplification, and the like on the baseband signal in the radio frequency band, and transmit the signal in the radio frequency band via the transmission/reception antenna 230.

On the other hand, the transmission/reception section 220(RF section 222) may amplify, filter, demodulate a baseband signal, or the like, with respect to a signal of a radio frequency band received by the transmission/reception antenna 230.

Transmission/reception section 220 (reception processing section 2212) may apply reception processing such as analog-to-digital conversion, FFT processing, IDFT processing (if necessary), filter processing, demapping, demodulation, decoding (including error correction decoding), MAC layer processing, RLC layer processing, and PDCP layer processing to the acquired baseband signal, and acquire user data.

The transceiver unit 220 (measurement unit 223) may also perform measurements related to the received signal. For example, the measurement unit 223 may also perform RRM measurement, CSI measurement, and the like based on the received signal. Measurement unit 223 may also measure for received power (e.g., RSRP), received quality (e.g., RSRQ, SINR, SNR), signal strength (e.g., RSSI), propagation path information (e.g., CSI), and the like. The measurement result may also be output to the control unit 210.

The transmitting unit and the receiving unit of the user terminal 20 in the present disclosure may be configured by at least one of the transmitting/receiving unit 220 and the transmitting/receiving antenna 230.

Furthermore, transmission/reception section 220 may receive a plurality of Downlink Shared channels (Physical Downlink Shared channels (PDSCHs)) (multiple PDSCHs) based on a plurality of Downlink control information (multiple PDCCHs).

The transceiver unit 220 may also receive a Physical Downlink Control Channel (PDCCH) setting in which the maximum number of Control Resource sets (CORESET) exceeds 3. The PDCCH setting may include, for example, 5 CORESET settings.

Control section 210 may also be configured to specify a Transmission Configuration Indication state (TCI state) of the PDCCH for the core set based on a medium access control element (MAC CE). The MAC CE may also be at least one of such UE-specific PDCCHs as described in the second embodiment above indicating MAC CEs with TCI status.

The control unit 210 may also envisage that the maximum number of said CORESETs for each CORESET does not exceed a certain number.

The control unit 210 may also assume that a value obtained by multiplying the maximum number of CORESET and the maximum number of BWPs to be set for each bandwidth part (BWP) does not exceed a specific number.

Based on the MAC CE, control section 210 may identify a CORESET Identifier (ID) corresponding to a certain CORESET group Identifier (ID), and determine the TCI state of the PDCCH for the CORESET indicated by the CORESET ID.

The MAC CE may further include a TCI status field for core set #0 only when the core set ID field has a specific value, in addition to the TCI status field for core set #0 other than core set # 0.

(hardware construction)

The block diagrams used in the description of the above embodiments represent blocks in functional units. These functional blocks (structural units) are realized by any combination of at least one of hardware and software. Note that the method of implementing each functional block is not particularly limited. That is, each functional block may be implemented by one physically or logically combined device, or by connecting two or more physically or logically separated devices directly or indirectly (for example, by wire or wireless) and by using these plural devices. The functional blocks may also be implemented by combining software in one or more of the above-described apparatuses.

Here, the functions include, but are not limited to, judgment, determination, judgment, calculation, processing, derivation, investigation, search, confirmation, reception, transmission, output, access, resolution, selection, establishment, comparison, assumption, expectation, view, broadcast (broadcasting), notification (notification), communication (communication), forwarding (forwarding), configuration (setting), reconfiguration (resetting), allocation (allocating, mapping), assignment (assigning), and the like. For example, a function block (a configuration unit) that functions as a transmission function may be referred to as a transmission unit (transmitting unit), a transmitter (transmitter), or the like. All as described above, the implementation method is not particularly limited.

For example, the base station, the user terminal, and the like in one embodiment of the present disclosure may also function as a computer that performs processing of the wireless communication method of the present disclosure. Fig. 12 is a diagram showing an example of hardware configurations of a base station and a user terminal according to an embodiment. The base station 10 and the user terminal 20 may be physically configured as a computer device including a processor 1001, a memory 1002, a storage 1003, a communication device 1004, an input device 1005, an output device 1006, a bus 1007, and the like.

In addition, in the present disclosure, languages such as a device, a circuit, an apparatus, a section (section), a unit (unit), and the like can be replaced with each other. The hardware configuration of the base station 10 and the user terminal 20 may be configured to include one or more of the illustrated devices, or may be configured not to include some of the devices.

For example, only one processor 1001 is illustrated, but there may be multiple processors. Further, the processing may be executed by 1 processor, or the processing may be executed by 2 or more processors simultaneously, sequentially, or by using another method. Further, the processor 1001 may be implemented by 1 or more chips.

Each function in the base station 10 and the user terminal 20 is realized by, for example, causing hardware such as the processor 1001 and the memory 1002 to read specific software (program), causing the processor 1001 to perform an operation to control communication via the communication device 1004 or to control at least one of reading and writing of data in the memory 1002 and the storage 1003.

The processor 1001 controls the entire computer by operating an operating system, for example. The processor 1001 may be configured by a Central Processing Unit (CPU) including an interface with a peripheral device, a control device, an arithmetic device, a register, and the like. For example, at least a part of the control unit 110(210), the transmitting and receiving unit 120(220), and the like may be implemented by the processor 1001.

The processor 1001 reads out a program (program code), a software module, data, and the like from at least one of the memory 1003 and the communication device 1004 to the memory 1002, and executes various processes in accordance with the read program (program code), software module, data, and the like. As the program, a program that causes a computer to execute at least a part of the operations described in the above-described embodiments is used. For example, the control unit 110(210) may be implemented by a control program stored in the memory 1002 and operated in the processor 1001, and may be implemented similarly for other functional blocks.

The Memory 1002 is a computer-readable recording medium, and may be configured by at least one of a Read Only Memory (ROM), an Erasable Programmable ROM (EPROM), an Electrically EPROM (EEPROM), a Random Access Memory (RAM), and other suitable storage media. The memory 1002 may also be referred to as a register, cache, main memory (primary storage), or the like. The memory 1002 can store a program (program code), a software module, and the like that are executable to implement the wireless communication method according to the embodiment of the present disclosure.

The storage 1003 is a computer-readable recording medium, and may be configured by at least one of a Floppy disk, a Floppy (registered trademark) disk, an optical disk (for example, a Compact disk ROM (CD-ROM)) or the like), a digital versatile disk, a Blu-ray (registered trademark) disk, a removable disk, a hard disk drive, a smart card (smart card), a flash memory (for example, a card (card), a stick (stick), a key drive), a magnetic stripe (stripe), a database, a server, and other appropriate storage media. The storage 1003 may also be referred to as a secondary storage device.

The communication device 1004 is hardware (transmission/reception device) for performing communication between computers via at least one of a wired network and a wireless network, and is also referred to as a network device, a network controller, a network card, a communication module, or the like. For example, communication apparatus 1004 may include a high-Frequency switch, a duplexer, a filter, a Frequency synthesizer, and the like, in order to realize at least one of Frequency Division Duplex (FDD) and Time Division Duplex (TDD). For example, the transmitting/receiving unit 120(220), the transmitting/receiving antenna 130(230), and the like described above may be implemented by the communication device 1004. The sending and receiving unit 120(220) may also be implemented by physically or logically separating the sending unit 120a (220a) and the receiving unit 120b (220 b).

The input device 1005 is an input device (for example, a keyboard, a mouse, a microphone, a switch, a button, a sensor, and the like) that receives an input from the outside. The output device 1006 is an output device (for example, a display, a speaker, an LED lamp, or the like) that outputs to the outside. The input device 1005 and the output device 1006 may be integrated (for example, a touch panel).

Further, the processor 1001, the memory 1002, and other devices are connected by a bus 1007 for communicating information. The bus 1007 may be configured using a single bus, or may be configured using different buses between devices.

The base station 10 and the user terminal 20 may be configured to include hardware such as a microprocessor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a Programmable Logic Device (PLD), a Field Programmable Gate Array (FPGA), or the like, and a part or all of the functional blocks may be implemented using the hardware. For example, the processor 1001 may also be implemented using at least one of these hardware.

(modification example)

In addition, terms described in the present disclosure and terms necessary for understanding the present disclosure may be replaced with terms having the same or similar meanings. For example, channels, symbols, and signals (signals or signaling) may be substituted for one another. Further, the signal may also be a message. The Reference Signal (Reference Signal) may also be referred to as RS, Pilot (Pilot), Pilot Signal, or the like, depending on the applied standard. Further, Component Carriers (CCs) may also be referred to as cells, frequency carriers, Carrier frequencies, and the like.

A radio frame may also be composed of one or more periods (frames) in the time domain. Each of the one or more periods (frames) constituting the radio frame may also be referred to as a subframe. Further, the subframe may be configured by one or more slots in the time domain. The subframe may also be a fixed time length (e.g., 1ms) independent of a parameter set (numerology).

Here, the parameter set (numerology) may be a communication parameter applied to at least one of transmission and reception of a certain signal or channel. The parameter set (numerology) may indicate, for example, at least one of SubCarrier Spacing (SCS), a bandwidth, a symbol length, a cyclic prefix length, a Transmission Time Interval (TTI)), the number of symbols per TTI, a radio frame structure, a specific filtering process performed by the transceiver in the frequency domain, a specific windowing process performed by the transceiver in the Time domain, and the like.

The time slot may be formed of one or more symbols in the time domain (Orthogonal Frequency Division Multiplexing (OFDM)) symbols, Single Carrier Frequency Division Multiple Access (SC-FDMA) symbols, or the like). Further, the time slot may also be a time unit based on a parameter set.

A slot may also contain multiple mini-slots. Each mini-slot may also be made up of one or more symbols in the time domain. In addition, a mini-slot may also be referred to as a sub-slot. A mini-slot may also be made up of a fewer number of symbols than a slot. PDSCH (or PUSCH) transmitted in a time unit larger than a mini slot may also be referred to as PDSCH (PUSCH) mapping type a. PDSCH (or PUSCH) transmitted using mini-slots may also be referred to as PDSCH (PUSCH) mapping type B.

The radio frame, subframe, slot, mini-slot, and symbol all represent a unit of time when a signal is transmitted. The radio frame, subframe, slot, mini-slot, and symbol may be referred to by other names respectively corresponding thereto. In addition, time units such as frames, subframes, slots, mini-slots, symbols, etc. in the present disclosure may be replaced with each other.

For example, 1 subframe may also be referred to as a TTI, a plurality of consecutive subframes may also be referred to as a TTI, and 1 slot or 1 mini-slot may also be referred to as a TTI. That is, at least one of the subframe and TTI may be a subframe (1ms) in the conventional LTE, a period shorter than 1ms (for example, 1 to 13 symbols), or a period longer than 1 ms. The unit indicating TTI may be referred to as a slot, a mini slot, or the like, and is not referred to as a subframe.

Here, the TTI refers to, for example, the minimum time unit of scheduling in wireless communication. For example, in the LTE system, the base station performs scheduling for allocating radio resources (frequency bandwidths, transmission powers, and the like that can be used by each user terminal) to each user terminal in TTI units. In addition, the definition of TTI is not limited thereto.

The TTI may be a transmission time unit of a channel-coded data packet (transport block), code block, code word, or the like, or may be a processing unit of scheduling, link adaptation, or the like. In addition, when a TTI is given, a time interval (for example, the number of symbols) to which a transport block, a code block, a codeword, and the like are actually mapped may be shorter than the TTI.

In addition, when 1 slot or 1 mini-slot is referred to as TTI, 1 TTI or more (i.e., 1 slot or more or 1 mini-slot) may be the minimum time unit for scheduling. The number of slots (the number of mini-slots) constituting the minimum time unit of the schedule may be controlled.

The TTI having a time length of 1ms can also be referred to as a normal TTI (TTI in 3GPP Rel.8-12), a normal TTI, a long TTI, a normal subframe, a long subframe, a slot, etc. A TTI shorter than a normal TTI may also be referred to as a shortened TTI, a short TTI, a partial TTI, a shortened subframe, a short subframe, a mini-slot, a sub-slot, a slot, etc.

In addition, a long TTI (e.g., a normal TTI, a subframe, etc.) may be replaced with a TTI having a time length exceeding 1ms, and a short TTI (e.g., a shortened TTI, etc.) may be replaced with a TTI having a TTI length smaller than the long TTI and equal to or longer than 1 ms.

The Resource Block (RB) is a Resource allocation unit in the time domain and the frequency domain, and the number of subcarriers included in one or a plurality of consecutive subcarriers (subcarriers) RB in the frequency domain may be the same regardless of the parameter set (numerology), for example, may be 12. The number of subcarriers included in the RB may also be decided based on a parameter set (numerology).

The RB may include one or more symbols in the time domain, and may have a length of 1 slot, 1 mini-slot, 1 subframe, or 1 TTI. Each of 1 TTI and 1 subframe may be configured by one or more resource blocks.

One or more RBs may also be referred to as Physical Resource Blocks (PRBs), subcarrier groups (SCGs), Resource Element Groups (REGs), PRB pairs, RB pairs, and the like.

Furthermore, a Resource block may also be composed of one or more Resource Elements (REs). For example, 1 RE may be a radio resource region of 1 subcarrier and 1 symbol.

The Bandwidth Part (BWP) (which may also be referred to as a partial Bandwidth or the like) may also represent a subset of consecutive common RBs (common resource blocks) for a certain set of parameters (numerology) in a certain carrier. Here, the common RB may also be determined by an index of an RB with reference to a common reference point of the carrier. A PRB may also be defined by a certain BWP and be assigned a sequence number within the BWP.

The BWP may include UL BWP (BWP for UL) and DL BWP (BWP for DL). For the UE, one or more BWPs may also be set within 1 carrier.

At least one of the set BWPs may be active, and the UE may not expect to transmit or receive a specific signal/channel other than the active BWP. In addition, "cell", "carrier", and the like in the present disclosure may also be replaced with "BWP".

The above-described structures of radio frames, subframes, slots, mini slots, symbols, and the like are merely examples. For example, the number of subframes included in the radio frame, the number of slots per subframe or radio frame, the number of mini-slots included in a slot, the number of symbols and RBs included in a slot or mini-slot, the number of subcarriers included in an RB, the number of symbols in a TTI, the symbol length, the Cyclic Prefix (CP) length, and other configurations can be variously changed.

The information, parameters, and the like described in the present disclosure may be expressed by absolute values, relative values to specific values, or other corresponding information. For example, the radio resource may also be indicated by a specific index.

The names used for parameters and the like in the present disclosure are not limitative names in any point. Further, the equations and the like using these parameters may be different from those explicitly disclosed in the present disclosure. The various channels (PUCCH, PDCCH, etc.) and information elements can be identified by any suitable names, and thus the various names assigned to these various channels and information elements are not limitative names in any point.

Information, signals, and the like described in this disclosure may also be represented using one of a variety of different technologies. For example, data, instructions, commands, information, signals, bits, symbols, chips, and the like that may be referenced throughout the above description may be represented by voltages, currents, electromagnetic waves, magnetic fields or particles, optical fields or photons, or any combination thereof.

Information, signals, and the like can be output from at least one of an upper layer (upper layer) to a lower layer (lower layer) and from the lower layer to the upper layer. Information, signals, and the like may also be input and output via a plurality of network nodes.

The information, signals, and the like that are input/output may be stored in a specific place (for example, a memory) or may be managed using a management table. The information, signals, and the like to be input and output can be overwritten, updated, or written in addition. The information, signals, etc. that are output may also be deleted. The input information, signal, and the like may be transmitted to another device.

The information notification is not limited to the embodiment described in the present disclosure, and may be performed by other methods. For example, the notification of Information in the present disclosure may be implemented by physical layer signaling (e.g., Downlink Control Information (DCI)), Uplink Control Information (UCI)), higher layer signaling (e.g., Radio Resource Control (RRC)) signaling, broadcast Information (Master Information Block (MIB)), System Information Block (SIB)), etc.), Medium Access Control (MAC)) signaling, other signals, or a combination thereof.

The physical Layer signaling may also be referred to as Layer1/Layer 2(Layer1/Layer2(L1/L2)) control information (L1/L2 control signals), L1 control information (L1 control signals), and the like. The RRC signaling may be referred to as an RRC message, and may be, for example, an RRC Connection Setup (RRC Connection Setup) message, an RRC Connection Reconfiguration (RRC Connection Reconfiguration) message, or the like. The MAC signaling may be notified using a MAC Control Element (CE), for example.

Note that the notification of the specific information (for example, the notification of "X") is not limited to an explicit notification, and may be performed implicitly (for example, by not performing the notification of the specific information or by performing the notification of another information).

The determination may be performed by a value (0 or 1) expressed by 1 bit, a true-false value (boolean) expressed by true (true) or false (false), or a comparison of numerical values (for example, a comparison with a specific value).

Software shall be construed broadly to mean instructions, instruction sets, code segments, program code, programs, subroutines, software modules, applications, software packages, routines, subroutines, objects, executables, threads of execution, procedures, functions, etc., whether referred to as software, firmware, middleware, microcode, hardware description language, or by other names.

In addition, software, instructions, information, and the like may also be transmitted or received via a transmission medium. For example, where software is transmitted from a website, server, or other remote source using at least one of wired technology (coaxial cable, fiber optic cable, twisted pair, Digital Subscriber Line (DSL)), etc.) and wireless technology (infrared, microwave, etc.), at least one of these wired and wireless technologies is included within the definition of transmission medium.

The terms "system" and "network" as used in this disclosure are used interchangeably. "network" may also mean a device (e.g., a base station) included in a network.

In the present disclosure, terms such as "precoding", "precoder", "weight", "Quasi-Co-location (qcl)", "Transmission setting Indication state (TCI state)", "spatial relationship (spatial relationship)", "spatial domain filter", "Transmission power", "phase rotation", "antenna port group", "layer number", "rank", "resource set", "resource group", "beam width", "beam angle", "antenna element", "panel", and the like can be used interchangeably.

In the present disclosure, terms such as "Base Station (BS)", "wireless Base Station", "Base Station apparatus", "fixed Station (fixed Station)", "NodeB", "enb (enodeb)", "gnb (gtnodeb)", "access Point (access Point)", "Transmission Point (TP)", "Reception Point (RP)", "Transmission Reception Point (Transmission/Reception Point (TRP))", "panel", "cell", "sector", "cell group", "carrier", and "component carrier" can be used interchangeably. A base station is also sometimes referred to by the terms macrocell, smallcell, femtocell, picocell, and the like.

A base station can accommodate one or more (e.g., three) cells. In a case where a base station accommodates a plurality of cells, the coverage area of the base station as a whole can be divided into a plurality of smaller areas, and each of the smaller areas can also be provided with a communication service by a base station subsystem (e.g., an indoor small base station (Remote Radio Head (RRH))). the term "cell" or "sector" refers to a part or the whole of the coverage area of at least one of the base station and the base station subsystem that performs a communication service in the coverage area.

In the present disclosure, terms such as "Mobile Station (MS)", "User terminal (User terminal)", "User Equipment (UE))", "terminal" and the like can be used interchangeably.

A mobile station is also sometimes referred to as a subscriber station, mobile unit, subscriber unit, wireless unit, remote unit, mobile device, wireless communication device, remote device, mobile subscriber station, access terminal, mobile terminal, wireless terminal, remote terminal, handset (hand set), user agent, mobile client, or some other appropriate terminology.

At least one of the base station and the mobile station may be referred to as a transmitting apparatus, a receiving apparatus, a wireless communication apparatus, or the like. At least one of the base station and the mobile station may be a device mounted on a mobile body, the mobile body itself, or the like. The moving body may be a vehicle (e.g., a car, an airplane, etc.), an unmanned moving body (e.g., an unmanned aerial vehicle, an autonomous vehicle, etc.), or a robot (manned or unmanned). At least one of the base station and the mobile station includes a device that does not necessarily move during a communication operation. For example, at least one of the base station and the mobile station may be an Internet of Things (IoT) device such as a sensor.

In addition, the base station in the present disclosure may also be replaced with a user terminal. For example, the various aspects and embodiments of the present disclosure may be applied to a configuration in which communication between a base station and a user terminal is replaced with communication between a plurality of user terminals (e.g., may also be referred to as Device-to-Device (D2D)), Vehicle networking (V2X), and the like). In this case, the user terminal 20 may have the functions of the base station 10 described above. The language such as "uplink" or "downlink" may be replaced with a language (e.g., "side") corresponding to inter-terminal communication. For example, the uplink channel, the downlink channel, and the like may be replaced with the side channel.

Also, the user terminal in the present disclosure may be replaced with a base station. In this case, the base station 10 may have the functions of the user terminal 20 described above.

In the present disclosure, it is assumed that the operation performed by the base station is also performed by its upper node (upper node) depending on the case. In a network including one or more network nodes (network nodes) having a base station, it is apparent that various operations performed for communication with a terminal can be performed by the base station, one or more network nodes other than the base station (for example, consider (but not limited to) a Mobility Management Entity (MME), a Serving-Gateway (S-GW), and the like), or a combination thereof.

The aspects and embodiments described in the present disclosure may be used alone, may be used in combination, or may be switched and used in conjunction with execution. Note that the order of the processing procedures, sequences, flowcharts, and the like of the respective modes/embodiments described in the present disclosure may be changed as long as there is no contradiction. For example, elements of various steps are presented in an exemplary order for the method described in the present disclosure, and the order is not limited to the specific order presented.

The aspects/embodiments described in the present disclosure may also be applied to Long Term Evolution (LTE), LTE-Advanced (LTE-a), LTE-Beyond (LTE-B), SUPER3G, IMT-Advanced, fourth generation Mobile communication System (4th generation Mobile communication System (4G)), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (FRA), New Radio Access Technology (New-Radio Access Technology (RAT)), New Radio (NR), New Radio Access (NX)), Future Radio Access (FX)), Global Mobile communication System (Global for Mobile) Mobile communication System (GSM), Mobile Radio Access (CDMA SUPER Mobile registration (2000), CDMA (CDMA))), Long Term Evolution (LTE-Advanced), LTE-Advanced (LTE-a), LTE-Advanced (LTE-B), LTE-Advanced (4G), fifth generation Mobile communication System (4th generation Mobile communication System (5G)), Future Radio Access (New Radio Access (FX), New Radio Access (NR), New Radio Access (n) (Mobile Radio Access (NX)), New Radio Access (CDMA SUPER Mobile communication System (CDMA, etc.)) -Mobile communication System, etc.) IEEE 802.11(Wi-Fi (registered trademark)), IEEE 802.16(WiMAX (registered trademark)), IEEE 802.20, Ultra-wideband (uwb), Bluetooth (registered trademark)), a system using another appropriate system, and a next-generation system extended based on these. Further, a combination of a plurality of systems (for example, LTE, or a combination of LTE-a and 5G) may be applied.

The expression "based on" used in the present disclosure does not mean "based only on" unless explicitly stated otherwise. In other words, the expression "based on" means both "based only on" and "based at least on".

Any reference to an element using the designations "first," "second," etc. used in this disclosure is not intended to be a comprehensive limitation on the quantity or order of such elements. These designations can be used in the present disclosure as a convenient method of distinguishing between two or more elements. Thus, reference to first and second elements does not imply that only two elements can be used or that in some form the first element must precede the second element.

The term "determining" used in the present disclosure sometimes includes various operations. For example, "determination (decision)" may be regarded as a case where "determination (decision)" is performed on determination (rounding), calculation (calculating), processing (processing), derivation (deriving), investigation (investigating), search (looking up), search (search), query (inquiry)) (for example, search in a table, a database, or another data structure), confirmation (authenticating), and the like.

The "determination (decision)" may be regarded as a case of "determining (deciding)" on reception (e.g., reception information), transmission (e.g., transmission information), input (input), output (output), access (e.g., access to data in a memory), and the like.

The "determination (decision)" may be regarded as "determination (decision)" performed for solving (resolving), selecting (selecting), selecting (breathing), establishing (evaluating), comparing (comparing), and the like. That is, "judgment (decision)" may also be regarded as "judgment (decision)" performed on some operation.

The "determination (decision)" may be replaced with "assumption (associating)", "expectation (expecting)", "consideration (associating)", or the like.

The term "connected", "coupled" or any variant thereof used in the present disclosure means all connections or couplings, directly or indirectly, between 2 or more elements, and can include a case where one or more intermediate elements exist between two elements that are "connected" or "coupled" to each other. The combination or connection between the elements may be physical, logical, or a combination thereof. For example, "connected" may also be replaced with "accessed".

In the present disclosure, in the case of connecting two elements, it can be considered to use more than one wire, cable, printed electrical connection, etc., and as some non-limiting (non-limiting) and non-inclusive examples, two elements are "connected" or "combined" with each other using electromagnetic energy having a wavelength of a wireless frequency domain, a microwave domain, a light (visible and invisible) domain.

In the present disclosure, the term "a is different from B" may also mean "a and B are different from each other". In addition, the term may also mean "a and B are different from C, respectively". The terms "separate", "combine", and the like are also to be construed as "different".

When the terms "include", "including", and "including" and their variants are used in the present disclosure, these terms are intended to be inclusive in the same way as the term "comprising". Further, the term "or" as used in this disclosure means not exclusive or.

In the present disclosure, where articles are added by translation, for example, as in the english language a, an, and the, the present disclosure may also include nouns that follow these articles in plural forms.

While the invention according to the present disclosure has been described in detail, it will be apparent to those skilled in the art that the invention according to the present disclosure is not limited to the embodiments described in the present disclosure. The invention according to the present disclosure can be implemented as a modification and a variation without departing from the spirit and scope of the invention defined by the claims. Therefore, the description of the present disclosure is for illustrative purposes, and the invention according to the present disclosure is not intended to be limited thereto.

Claims (6)

1. A terminal, characterized by having:

a receiving unit, configured to receive PDCCH setting, which is physical downlink control channel setting in which the maximum number of CORESET, which is a control resource set, exceeds 3; and

the control unit is assumed to specify a TCI state, which is a transmission setting indication state of the PDCCH for the CORESET, based on a MAC CE, which is a medium access control element.

2. The terminal of claim 1,

the control unit envisages that the maximum number of said CORESET for each CORESET does not exceed a certain number.

3. The terminal of claim 1,

the control unit envisages: the value obtained by multiplying the maximum number of CORESET for each bandwidth part, i.e., BWP, and the set maximum number of BWP does not exceed a specific number.

4. A terminal according to any of claims 1 to 3,

the control unit identifies a CORESET ID corresponding to a CORESET group ID that is a certain CORESET group identifier, based on the MAC CE, and determines the TCI state of the PDCCH for the CORESET indicated by the CORESET ID.

5. The terminal according to any of claims 1 to 4,

the MAC CE includes a TCI status field for core set #0 only when the core set ID field is a specific value, in addition to the TCI status field for core set other than core set # 0.

6. A wireless communication method for a terminal, comprising:

receiving a Physical Downlink Control Channel (PDCCH) setting in which the maximum number of control resource sets (CORESETs) exceeds 3; and

it is assumed that a TCI state, which is a transmission setting indication state of the PDCCH for the CORESET, is specified based on a MAC CE, which is a medium access control element.

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